netdev - RE: [PATCH v4 resend 04/23] ice: Register auxiliary device to provide RDMA

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Date:   Mon, 12 Apr 2021 14:51:23 +0000
From:   "Saleem, Shiraz" <shiraz.saleem@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     "dledford@...hat.com" <dledford@...hat.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
Subject: RE: [PATCH v4 resend 04/23] ice: Register auxiliary device to provide
 RDMA

> Subject: Re: [PATCH v4 resend 04/23] ice: Register auxiliary device to provide
> RDMA
> 
> On Tue, Apr 06, 2021 at 07:14:43PM -0500, Shiraz Saleem wrote:
> > +/**
> > + * ice_plug_aux_devs - allocate and register one AUX dev per
> > +cdev_info in PF
> > + * @pf: pointer to PF struct
> > + */
> > +int ice_plug_aux_devs(struct ice_pf *pf) {
> > +	struct iidc_auxiliary_dev *iadev;
> > +	int ret, i;
> > +
> > +	if (!pf->cdev_infos)
> > +		return 0;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(ice_cdev_ids); i++) {
> > +		struct iidc_core_dev_info *cdev_info;
> > +		struct auxiliary_device *adev;
> > +
> > +		cdev_info = pf->cdev_infos[i];
> > +		if (!cdev_info)
> > +			continue;
> > +
> > +		iadev = kzalloc(sizeof(*iadev), GFP_KERNEL);
> > +		if (!iadev)
> > +			return -ENOMEM;
> > +
> > +		adev = &iadev->adev;
> > +		cdev_info->adev = adev;
> > +		iadev->cdev_info = cdev_info;
> > +
> > +		if (ice_cdev_ids[i].id == IIDC_RDMA_ID) {
> > +			if (cdev_info->rdma_protocol ==
> > +			    IIDC_RDMA_PROTOCOL_IWARP)
> > +				adev->name = kasprintf(GFP_KERNEL, "%s_%s",
> > +						       ice_cdev_ids[i].name,
> > +						       "iwarp");
> > +			else
> > +				adev->name = kasprintf(GFP_KERNEL, "%s_%s",
> > +						       ice_cdev_ids[i].name,
> > +						       "roce");
> > +		} else {
> > +			adev->name = kasprintf(GFP_KERNEL, "%s",
> > +					       ice_cdev_ids[i].name);
> 
> This never happens, it is dead code, right?
> 
> > +		}
> 
> This is all confused, the adev->name is supposed to be a compile time constant,
> this not be allocating memory and combining the constant "intel_rdma" and the
> trailing "iwarp" "roce"
> 
> Just use the proper define right here.
> 
> Also all these kasprintfs should have their errors checked, which is also why it
> shouldn't be written like this.
> 

Agree to all the feedback here.